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  • 1
    Electronic Resource
    Electronic Resource
    meso-[2.2]Paracyclophenyltriphenylporphyrin. Electronic consequences of linking paracycliphane to porphyrin (1989)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 111 (1989), S. 607-616 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00184a031
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Centenary of Dalton's Death (1944)
    [s.l.] : Nature Publishing Group
    Nature 154 (1944), S. 240-240 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE Manchester Literary and Philosophical Society, which was so closely associated with John Dalton during the whole of his life in Manchester, is commemorating his work on the occasion of the centenary of his death which falls this year. The first meeting of next session is to be devoted to a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/154240c0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Depletion of reserves in ant queens during claustral colony founding (1996)
    Springer
    Insectes sociaux 43 (1996), S. 297-302 
    Details
    ISSN: 1420-9098
    Keywords: Storage protein ; lipid ; mating flight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Gynes in the claustrally-founding speciesCrematogaster opuntiae andCamponotus festinatus accumulate large amounts of protein and lipid between the time of eclosion and mating. During colony founding, protein is depleted from both the thorax and abdomen and lipid from the abdomen. The abdomen, and specifically its accumulated storage protein, provides an amino acid store equivalent to or larger than that of flight muscle. The importance of this second major protein reserve in the evolution of claustral colony founding should be considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242930
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  • 4
    Electronic Resource
    Electronic Resource
    Estimation of sperm numbers in insects by fluorometry (1995)
    Springer
    Insectes sociaux 42 (1995), S. 449-452 
    Details
    ISSN: 1420-9098
    Keywords: Sperm quantification ; sperm counts ; ants ; fluorometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary To facilitate the study of mating biology in the desert leaf-cutter antAcromyrmex versicolor, methods were developed that allowed storage and easy quantification of sperm samples collected from both male and female reproductive tracts. Sperm samples stored frozen were sonicated, stained with a fluorescent DNA stain, and the fluorescence emitted by the stained sperm heads was measured. The intensity of fluorescence was shown to be a linear function of the number of sperm in the sample as determined by counting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242172
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  • 5
    Electronic Resource
    Electronic Resource
    Behavioral response to hydrostatic pressure in larvae of two species of xanthid crabs (1978)
    Springer
    Marine biology 46 (1978), S. 167-174 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Responses of pelagic larvae of two species of xanthid crabs to manipulations of hydrostatic pressure were examined and compared. One species, Rhithropanopeus harrisii (Gould), is a temperate estuarine species, while the other, Leptodius floridanus (Gibbes), inhabits shallow water and reefs in tropical and subtropical regions. All zoeal stages of R. harrisii detected pressure stimuli presented in increments as small as 0.025 atm. Both Stage I and II zoeae of L. floridanus responded to pressure stimuli presented in increments of 0.1 atm. Stage I responded when pressure was changed by the smallest increment tested, 0.025 atm, but Stage II did not. L. floridanus zoeal Stages III and IV, however, did not change vertical position relative to control larvae when subjected to pressure stimuli. The capacity of R. harrisii zoeae to respond to changes in hydrostatic pressure may be related to their retention in the estuarine environment. In L. floridanus, a non-estuarine species, the pressure response is important only in the first zoeal stage and may function promarily in dispersal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391533
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  • 6
    Electronic Resource
    Electronic Resource
    Multiple mating in the ant Acromyrmex versicolor: a case of female control (1996)
    Springer
    Behavioral ecology and sociobiology 38 (1996), S. 219-225 
    Details
    ISSN: 1432-0762
    Keywords: Key wordsAcromyrmex versicolor ; Polyandry ; Sperm utilization ; Paternity ; RAPD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In eusocial insects, polyandrous mating has the potential to reduce genetic relatedness of individuals within a colony, which may have a profound effect on the stability and social structure of the colony. Here we present evidence that multiple mating is common in both males and females of the desert leaf-cutter ant Acromyrmex versicolor. Females seem to have complete control over the number of matings, and mate on average with three males, even though the sperm transferred in a single copulation is sufficient to fill the spermatheca. To determine whether there is a bias in the representation of sperm from different mates in the spermatheca, females were mated to three or four males in controlled mating experiments and were subsequently allowed to found colonies in the laboratory. Paternity analysis of the offspring by random amplified polymorphic DNA analysis showed that all males that have been mated to a female successfully contributed sperm to the production of her offspring. No significant asymmetry in sperm use was detected, suggesting complete sperm mixing. Different hypotheses to explain polyandrous mating are discussed, and it is argued that the best hypothesis to explain polyandrous mating and complete sperm mixing in A. versicolor is that utilizing genetically diverse sperm confers a selective advantage on females.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002650050235
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    Paper (German National Licenses)
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